This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A248649 #12 Dec 16 2023 18:19:38
%S A248649 130,170,290,370,410,442,530,610,730,754,890,962,970,986,1010,1066,
%T A248649 1090,1105,1130,1258,1370,1378,1394,1490,1570,1586,1730,1802,1810,
%U A248649 1885,1898,1930,1970,2074,2146,2290,2314,2330,2378,2405,2410,2465,2482,2522,2570
%N A248649 Numbers n that are the product of three distinct primes such that x^2+y^2 = n has integer solutions.
%C A248649 Union of 2*A131574 and A264498. - _Ray Chandler_, Dec 09 2019
%H A248649 Ray Chandler, <a href="/A248649/b248649.txt">Table of n, a(n) for n = 1..10000</a>
%e A248649 130 is in the sequence because 130 = 2*5*13, and x^2+y^2=130 has integer solutions (x,y) = (3,11) and (7,9).
%e A248649 1105 is in the sequence because x^2 + y^2 = 1105 = 5*13*17 has solutions (x,y) = (4,33), (9,32), (12,31) and (23,24).
%t A248649 Select[Range[3000],PrimeNu[#]==PrimeOmega[#]==3&&FindInstance[x^2+y^2==#,{x,y},Integers]!={}&] (* _Harvey P. Dale_, Dec 16 2023 *)
%Y A248649 Cf. A131574, A264498, A248712.
%K A248649 nonn
%O A248649 1,1
%A A248649 _Colin Barker_, Oct 12 2014